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最新的 Confluent Certified Developer CCDAK 免費考試真題 (Q40-Q45):
問題 #40
An ecommerce wesbite sells some custom made goods. What's the natural way of modeling this data in Kafka streams?
- A. Purchase as table, Product as table, Customer as table
- B. Purchase as stream, Product as table, Customer as stream
- C. Purchase as stream, Product as stream, Customer as stream
- D. Purchase as stream, Product as table, Customer as table
答案:D
解題說明:
Mostly-static data is modeled as a table whereas business transactions should be modeled as a stream.
問題 #41
Which partition assignment minimizes partition movements between two assignments?
- A. RoundRobinAssignor
- B. StickyAssignor
- C. PartitionAssignor
- D. RangeAssignor
答案:B
解題說明:
TheStickyAssignortries to minimize partition movement bypreserving existing assignmentsas much as possible while still achieving a balanced assignment. This improvesconsumer stabilityand reduces rebalances.
From theKafka Consumer Assignor Documentation:
"The StickyAssignor attempts topreserve as many existing assignments as possible, which helps minimize partition movement between rebalances."
* RoundRobinAssignor focuses on even distribution, not stability.
* RangeAssignor groups partitions by topic and assigns them consecutively, but can lead to imbalances.
* PartitionAssignor is an abstract base class, not an assignor used directly.
Reference:Kafka Consumer Assignor Docs
問題 #42
How will you find out all the partitions where one or more of the replicas for the partition are not in-sync with the leader?
- A. kafka-topics.sh --bootstrap-server localhost:9092 --describe --unavailable- partitions
- B. kafka-topics.sh --zookeeper localhost:2181 --describe --unavailable- partitions
- C. kafka-topics.sh --broker-list localhost:9092 --describe --under-replicated-partitions
- D. kafka-topics.sh --zookeeper localhost:2181 --describe --under-replicated-partitions
答案:D
問題 #43
Which statement describes the storage location for a sink connector's offsets?
- A. The __consumer_offsets topic, like any other consumer
- B. The topic specified in the offsets.storage.topic configuration parameter
- C. In a file specified by the offset.storage.file.filename configuration parameter
- D. In memory which is then periodically flushed to a RocksDB instance
答案:A
解題說明:
Kafka Connectsink connectorsuse thestandard Kafka consumer mechanismto track offsets, which means offsets are stored in the__consumer_offsets internal topic.
FromKafka Connect Documentation:
"Sink connectors are regular Kafka consumers and store their offsets in the __consumer_offsets topic like any other consumer."
* The other options refer tosource connectorsor worker configuration.
* offsets.storage.topic is relevant forsource connectors.
Reference:Kafka Connect Concepts > Sink Connectors and Offset Storage
問題 #44
You have a Kafka consumer in production actively reading from a critical topic.
You need to update the offset of your consumer to start reading from the beginning of the topic.
Which action should you take?
- A. Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
- B. Update the consumer configuration by setting auto.offset.reset=earliest.
- C. Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
- D. Start a new consumer application with the same consumer group id.
答案:A
解題說明:
To reset offsets for anexisting consumer group, you must use thekafka-consumer-groups.shtool with the -- reset-offsets and --to-earliest flags.
FromKafka Consumer Group Tool Documentation:
"You can use the kafka-consumer-groups tool to reset offsets for a consumer group. This is required if the consumer has already committed offsets."
* Setting auto.offset.reset=earliest only worksif no committed offset exists.
* Starting a new consumer with the same group won't reset offsets.
* Retention settings don't affect committed offsets.
Reference:Kafka Consumer Group CLI Tool
問題 #45
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